You might want Dizzy Dragon's generator. It does encounters and treasure, although no random encounters. The dungeons are generated from geomorphs, so the maps are more complex and interesting than the fully random versions. Each map will have some three dimensionality, with stairs up to some sections and so forth.

@James: Welcome! Can you explain which things it does do and why it does those things better than most?
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yhw42Oct 3 '10 at 15:21

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That's a very interesting generator, and definitely filling a different niche than most. Adding a brief overview of its features and design goals would make this a good answer.
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SevenSidedDieOct 3 '10 at 15:48

Dizzy Dragon is amazing. I’d also recommend using The Fantasy Oracle to add an overall theme to the adventure. It provides a handful of adventure elements that make it easier to create a background for the random dungeon.